Method for the preparation of a material with high water and salt solutions absorbency

a technology of absorbency and high water content, which is applied in the field of preparation of materials with high water and salt solutions absorbency, can solve the problems of poor biodegradability of cellulose based materials, the salts of polyacrylic acids are used in the preparation of non-fibrous pulp additions, papermaking,

Inactive Publication Date: 2000-02-22
AKZO NOBEL NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, preparing a material with a high water and salt solutions absorbency in two different process steps (spinning the fibres and subjecting them to chemical modification) constitutes a substantial drawback to this process.
A drawback to materials based on the salts of polyacrylic acids is their poor biodegradability as compared with cellulose based materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2

In the same fashion as described in Example 1 18,8 g of Alphacell.RTM. (DP=2300) were dissolved at 12.degree. C. in a solvent obtained by mixing 68,9 g of orthophosphoric acid and 101,5 g of polyphosphoric acid. After 6 hours of mixing at 12.degree. C. the mixture was stored for 15 hours at 10.degree. C. After this the solution was coagulated, washed, filtered, and neutralised in the manner described in Example 1. The material contained 5,3 wt. % of phosphorus prior to neutralisation and 4,0 wt. % of phosphorus after neutralisation.

The resulting material (DP=1000) had a free absorption of water of 23,8 g / g and a free absorption of a salt solution of 13,6 g / g.

example 3

In the same fashion as described in Example 1 26,0 g of cotton linters (DP=5900) were dissolved for 5 hours at 20-30.degree. C. in a solvent obtained by mixing 119,0 g of orthophosphoric acid and 175,7 g of polyphosphoric acid. The solution was coagulated, washed, filtered, and neutralised in the manner described in Example 1. The material contained 4,5 wt. % of phosphorus prior to neutralisation and 3,5 wt. % of phosphorus after neutralisation.

The resulting material (DP=1850) had a free absorption of water of 30 g / g and a free absorption of a salt solution of 8,5 g / g.

example 4

In the same fashion as described in Example 1 26,0 g of cotton linters (DP=5900) were dissolved for over 6 hours at 20-35.degree. C. in a solvent obtained by mixing 151,3 g of orthophosphoric acid and 228,0 g of polyphosphoric acid.

The solution was coagulated and washed in an acetone / ethanol mixture, and then filtered and neutralised, all in the manner described in Example 1. The material contained 11,9 wt. % of phosphorus prior to neutralisation and 7,4 wt. % of phosphorus after neutralisation.

The resulting material (DP=280) dissolved in water.

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Abstract

PCT No. PCT/EP97/00652 Sec. 371 Date Aug. 6, 1998 Sec. 102(e) Date Aug. 6, 1998 PCT Filed Feb. 12, 1997 PCT Pub. No. WO97/30090 PCT Pub. Date Aug. 21, 1997A process for preparing a material having a high water and salt solutions absorbency, the material containing mainly cellulose that is dissolved in a solvent containing phosphoric acid, a solution is obtained that contains 94-100 wt. % of the following constituents: cellulose, phosphoric acid and/or its anhydrides, and water, the solution is then coagulated and washed in a liquid containing less than 50 wt. % of water. This process can be used to obtain cellulose products, such as fibers or pulp, which have a high water and (isotonic) salt solutions absorbency.

Description

The invention pertains to a process for the preparation of a material with a high water and salt solutions absorbency, said material containing mainly cellulose.A material with a high water and (isotonic) salt solutions absorbency is also known as a superabsorbent. Superabsorbents are used, int. al., in personal hygiene products, such as disposable diapers, tampons, sanitary napkins, and incontinence pads. Superabsorbents in the form of fibres can be used, int. al., in moisture-absorbing cloths or in towels.DESCRIPTION OF RELATED ARTA superabsorbent mainly containing cellulose is known from WO 93 / 112275. In this patent application the preparation of cellulose based superabsorbents, notably cellulose based fibres, is described, which comprises cellulose fibres being spun and the thus formed fibres being subjected to chemical modification in a subsequent process to form carboxy-methyl-cellulose (CMC) fibres. However, preparing a material with a high water and salt solutions absorbency...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08B5/00C08B1/00D01F2/00D01F2/02
CPCC08B1/003C08B5/00D01F2/02
Inventor WESTERINK, JAN BARENDBOERSTOEL, HANNEKEMAATMAN, HENDRIK
Owner AKZO NOBEL NV
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